People think about taking their own life because of numerous causes, often resulting from severe mental anguish. 
Feelings of hopelessness might overpower their desire to continue. Frequently, isolation contributes heavily in pushing someone toward such thoughts. 
Psychological disorders can cloud judgment, preventing someone to find other solutions to their pain. 
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External pressures might further drive an individual to consider drastic measures. 
Limited availability of resources can make them feel stuck. Keep in mind that reaching out can save lives.